Heat exchanger



,OL 10, 1944. N A ARVlNs ErAL l2,360,094' i HEAT EXCHANGER Filed May 17, 1941 l *It ATTorN UNITED, STATES PATENT OFFICEy HEAT EXCHANGER Nathan A. Arvins and Abraham A. Arvintz, Brooklyn, N. Y., assignors to Monitor-Heat Exchange Corporation; a corporation of New York Application May 17, 1941, Serial No. 393,970

6 Claims.

This invention relates to heat exchangers or what mayalso be termed preheaters, and particularly to apparatus of this type and kind adapted primarily for use in preheating fuel oil prior to the feed of such `oil to oil burners; and the object of the invention is to provide an apparatus of the class described whereinthe steam circulating unit comprising a plurality of pipes or coils may be quickly and easily attached and detached with respect to the casing of the apparatus without disturbing the various pipes coupled therewith; a further object being to provide a unit of the class described wherein the casing or housing of said unit forms 'a safety chamber or Jacket surrounding the steam circulating coils or pipes to insulate and shield the steam from the oil circulating passages in the .event of a leak or breakdown in the steam tubes thereby preventing contamination of the fuel oil; a further object being to provide a unit of the character described wherein the casing or cylinder thereof includes on its periphery spiral flns forming a continuous spiral oil feed passage longitudinally of the periphery thereof Ywithin the outer casing of the apparatus so as to retard the ilow of oil through the apparatus and extended over the greatest possible circumference with respect to the heating medium contained thereinto provide an efcient heat transfer to the fuel oil; a further object being to provide a fitting coupling the outer casing with the tube or casing of said unit and to provide, for the chamber of said unit, a safety blow-olf valve in the event of the discharge of steam into said chamber; and with these andother objects in view, the invention consists in an apparatus of the class and for the purpose specified, which is constructed as more fully hereinafter described.

The invention is fully disclosed in the following specification, of vwhich the accompanying drawing forms a part, in which the separate parts of our invention are designated by suitable reference characters in each of the views; and in which:

Fig. 1 is a longitudinal sectional view through a preheater made according to the invention with part of the construction shown in elevation.

Fig. 2 is a View similar to Fig. 1 showing further parts in elevation with parts of the construction broken away, and also illustrating the parts in a semidetache`d relationship.

From the following description and-in making reference to the accompanying drawing, the inyention will be vdescribed as an `oil preheater in `illustrating one adaptationof the heat exchanging apparatus. It will be understood, however,

that 'the apparatus may be used for any purpose, and while the present apparatus is further described for use in dealing with high pressure steam as a heat medium, other heating mediums may be employed. Still further, it will be understood that any type of fluid may be circulated through the spiral passages which are provided.

In the drawing I0 represents a `main casing or jacket of the apparatus which is flanged at its ends as seen at II and I2. At I3 is shown an inlet boss providing for the admission of oil into the chamber I4 of the jacket I Il; and at I5 is shown the discharge boss from which oil or other fluid circulated through the chamber I4 is discharged. These inlets and outlets are disposed at opposite ends of the jacket I Il as clearly seen in the drawing. Coupled with the flanged end II of the jacket is a steam dispersing chamber I6, divided by a partition I1 into an inlet side I8 and an outlet side I9, the inlet passage to the chamber I8 being shown at 20 and the outlet of the chamber I9 being shown at 2|.

A Supported between' the flange portion 22 of the steam chamber or header I6 and the flange II is a gasket 23, which is exposed for engagement with the end plate 24 of a heater unit 25. This unit comprises an elongated tubular casing 26 outwardly ilanged at one end as seen at 21. The

other end of the heater casing or tube 26 has a similar flange 28, enlarged to extend into a recess 29 in the face of the flange I2, the casing having an end plate 3D. A gasket 3| is disposed between the flange 32 of a dome-shaped closure chamber I8 is permitted to pass into other tubes 36 discharging into the chamber I9.

While only two tubes 35 and 36 are shown for illustrative purposes, it will be understood that,

any number of these tubes may be employed depending upon the capacity of the apparatus. In

this respect, the present illustration is somewhatY diagrammatic. The tubes 35and 36 are permanently secured in the plates 24 and 30 by spinning over, welding or otherwise. It will thus be apparent that when the parts are assembled a complete unit 25 is formed.A

The cover 33 is detachable with respect to the flange I2 by bolts 31, and other bolts 38 are employed in coupling the ange II with the :flange 22.

The tube or casing 2s is provided at longitu- Sages.

dinally spaced intervals with two sets ofcircumferentially arranged -projections 36 which serve to support the tube within the chamber I4 of the jacket I0. -Also arranged on the periphery of the tube 26 is a continuous spiral fln lllwhich' forms in the chamber I4 a continuous spiral pasage 4I. The fins are spaced slightly from the wail'of the casing I0 in the construction shown simply to avoid thenecessity of having to finish the surfaces of the fin. When it is desirable to form a complete seal of the fin in `the bore of the jacket I0, the same may be sufficiently large and finished for this purpose.l

However, in the present. described use of the invention, any slight seepage of the oil circulated through the spiral passage 4I vwill not be objectionable. It will thus appear that the oil in entering the spiral passage 4I adjacent theinlet I3 will then flow` around the tube or casing 36y through the spiral passage 4I and be discharged through the outlet I5. In this manner the progress of the oil is retarded and the oil is at the same time extended over the greatest possible area of the heater tube 26.

Centrally of the jacket III is formed a large aperture 42 in registering alinement with a threaded boss 43 on the tube 26 so that a fitting 44 may be coupled with the tube 26 and positively vseated upon the boss 43 to form a discharge passage communicating with the chamber 45 of the tube 26. It will thus appear that in the event of a leakage or breakage in any one 0f the tubes 35, 36, an exhaust is provided for the steam which enters the chamber 45, and on the tting may be arranged a suitable safety blow-olf valve, not shown. The fitting 44 has a flange 46 arranged substantially in alinement with the outside diameter of the jacket IU and fitting freely within the aperture 42 so as to compensate for longitudinal movement of the tube 26 in the jacket, and the fitting is sealed on the jacket I0 by a nut 41 operating upon a washer 48 and gasket 49.

It will appear from a consideration of Fig. 2 of the drawing that the main casing of the apparatus; that is to say, the jacket I0 including the steam chamber or header I6 may be xedly rretained in position with all of the pipe couplings therewith undisturbed in the operation' of attaching and detaching the heater unit 25. This unit may be detached by simply removing the cover 33, the fitting 44, and removing a screw 50 arranged in an enlarged portion 5I of the partition I1 and engaging the end plate 24 to firmly support the casing `in engagement with the gasket 23. When these are removed, the unit may be pulled through the flanged end I2 of the casing as is clearly illustrated in Fig. 2. After the desired repairs have been made, the

, parts may be reassembled by first 'inserting the unit 25 into the jacket I0, securely mounting the same by the screw 50, then replacingY the fitting 44 and cover 33.

In considering the apparatus as a heat exchanger generally, it will be understood that heating or cooling mediums employed may be circulated through the tubes 35, 36, or the spiral passage 4I, and the fluid to be processed may likewise be circulated through either of the pas- In further uses of the invention, the chamber 45, instead of simply being an air chamber, may contain a heat transmitting or conducting medium in the form of anelement or a fluid; and when fluids are utilized which are subject to evaporation, a supply.. or replenishment of the fluid can take place through the ntting 44. When powdered or granular materials are employed, such for example'as powdered copper, these may be inserted through the fitting 44 or through a, plug 52 arranged centrally of the end wall 3|) and accessible when the cover 33 is removed.

Having fully described our invention, what we claim as new and desire to secure by Letters Patent, is:

` 1. In a heat exchanger the combination with a fixed jacket having means forming inlet and outlet chambers at one end thereof, of a circulating unit detachable with respect to said jacket, said unit being insertable and removable through the other open end of said jacket and sealed at said end by a detachable cover, said unit comprising an elongated tubular body having within the bore thereof 'circulating tubes adapted to communicate with said inlet and outlet chambers and with a return header chamber formedl in said cover, means extending longitudinally of the outer wall of said unit forming in cooperation with the tubular body and the wall of said jacket a continuous spiral circulating passage extendingA from one end of the jacket to the other end thereof, and said jacket having inlet and outlet passages 4communicating with the ends of said circulating passage.

2. In a heat exchanger the combination with a fixed jacket having means forming inlet and outlet chambers 'at one end thereof, of a circulating unit detachable with respect to said jacket,

said unit being insertable and removable through the other open end of said jacket and sealed at said end by a detachable cover, said unit comvsealed at the ends of said tubular body, and

means forming a passage opening into said chamber.

3. A heat exchanger of the class described comprising a, main ljacket, a centrally partitioned header c over detachable with respect to one end ofthe jacket, a cover plate detachable with respect to the other end of the jacket, a. unit detachable with respect to said jacket upon the removal of said cover plate, said unit comprising an elongated tubular casing spaced with respect to the walls of said jacket to form a circulating chamber between said unit and jacket, said unit having end walls closing the ends of said circulating chamber, said header cover forming in conjunction with one end wall, of the unit intake and discharge chambers, said cover plate forming in conjunction with the other end wall of the unit a return header for a medium circulated through said first mentioned inlet and discharge and outlet passages in opposite ends thereof com municating with the circulating chamber.

4. A heat exchanger of the class described comprising a main jacket, a centrally partitioned header cover detachable with respect to one end of the jacket, a cover plate detachable with respect to the other end of the jacket, a unit de tachable with respect to said jacket upon the removal of said cover plate, said unit comprising an elongated tubular casing spaced with respect to the walls of said jacket to form a circulating chamber between said unit and jacket, said .unit having end Walls closing the ends of said circulating chamber, said header cover forming in conjunction with one end Wall of the unit intake and discharge chambers, said cover plate forming in conjunction with the other end wall of the unit a return header for amedium circulated through said first mentioned inlet and discharge chambers, a plurality of circulating tubes arranged in and extending longitudinally of said unit in communication with said inlet and discharge chambers, said jacket having vinlet and outlet passages in opposite ends thereof communicating with the circulating chamber, and a tting coupled with said jacket and unit casing providing a passage communicatinggwith the chamber of said casing. Y

5. In heat exchangers of the class described, the combination with an outer jacket open at one end and a detachable cover closing said open lend, of a circulating unit detachable with re-V spect to said jacket through said open end, said unit comprising an elongated tubular body having connected 'end Walls, said end walls being ot greater diameter than the diameter of said body forming circumferential end flanges on said body,

said unit forming in said jacket a chamber closed at the ends of the jacket by said end flanges, a spiral fin connected to and extending longitudinally of said body to form a spiral circulating passage in said chamber opening through opposite ends of said jacket, means extending longitudinally through said tubular body and spaced with respect to the walls thereof forming other circulating passages opening through opposite end walls of said body, said end walls forming within the tubular body a chamber around said rst named means, and means detachable with respect to said body and jacket forming a fluid connection with said last mentioned chamber.

6. In heat exchangers, the combination with a main jacket having a partitioned header cover at one end and a header cover detachable with respect to the other open end of said jacket, of a circulating unit freely detachable with respect to said jacket through said open end, said unit comprising an elongated tubular body having connected end walls, said end walls including radially extending circumferential flanges, said unit forming in said jacket a chamber closed at the ends of the jacket by the end anges of said unit, said end walls forming within said tubular body a chamber, means mounted in said end walls andextending through said body chamber and opening into said header covers forming circulating passages in said body chamber, means detachable with respect to said body and jacket forming a uid connection with said body chamber, and said outer jacket having means establishing fluid intake and discharge for the first name chamber.

NATHAN A. ARVINS. .ABRAHAM A. ARVINTZ. 

